誰かがsewer networkのstream order spatial analyst toolを使ったことがありますか？

Question

<\/HEAD>私は学校や仕事のための下水道解析プロジェクトに取り組んでおり、stream order networking toolを使って下水道ネットワークを順序付けしようとしていますが、とても混乱する結果が出ています。下水道ネットワークのラスタグリッドは作成できますが、正確なflow direction rasterを作成できません。flow directionの値が私には意味不明です。以下に結果を示すスクリーンショットがあります。<\/P> <\/P> これらのツールの使用経験がある方で、フィードバックをいただけると非常にありがたいです。 <\/P> <\/P> <\/P> <\/P> <\/P> <\/P> <\/P><\/BODY><\/HTML>

HowardCrothers · Answer

You might be able to use the Summary Flow Accumulation tool on the Water Utility Network Reporting toolbar to get at the answer.  Requires your data to be in a geometric network.  You could use it sum the number of upstream manholes for each pipe and use that a proxy or if you have customer connections you could assign a weight to each connection and accumulate that for each upstream pipe. Water Utility Network Reporting toolbar - Water Utility Network Editing and Analysis | ArcGIS Solutions for Water

EricSwett · Answer

Howard,

Thank you for your reply. I currently have a vector sewer network, but I am trying to identify the pipes in the system as first, second, third-order pipes. I have data from our hydraulic sewer model, which shows flow data, but I want to be able also to see which pipe segments have "upstream branches" and how many branches are upstream.

I haven't been able to find a vector stream ordering tool so I was trying to see if I could convert the vectors into rasters and use the tools, but no luck.

Thanks,

Eric

HowardCrothers · Answer

Not sure exactly what your project is, but the hydrology tools like Stream Order and Flow Direction are used to analyze surface flow across a continuous surface, like a DEM.  So those tools are typically used for surface water, not for pipes.

The first bullet point under Usage sounds like the results you are experiencing if you turned your pipes into a raster - Stream Order—Help | ArcGIS Desktop

Most organizations represent their sewer system using vector data (typically a network) and use that vector data to perform analysis.